package cn.com.yw.config;

import com.alibaba.csp.sentinel.adapter.spring.webmvc.callback.BlockExceptionHandler;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.alibaba.csp.sentinel.slots.block.authority.AuthorityException;
import com.alibaba.csp.sentinel.slots.block.degrade.DegradeException;
import com.alibaba.csp.sentinel.slots.block.flow.FlowException;
import com.alibaba.csp.sentinel.slots.block.flow.param.ParamFlowException;
import com.alibaba.csp.sentinel.slots.system.SystemBlockException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@Configuration
public class SentinelConfig {

    @Bean
    public BlockExceptionHandler blockExceptionHandler(){
        return new BlockExceptionHandler() {
            @Override
            public void handle(HttpServletRequest httpServletRequest, HttpServletResponse response, BlockException ex) throws Exception {
                String msg = null;
                if (ex instanceof FlowException) {
                    msg = "限流了";
                } else if (ex instanceof DegradeException) {
                    msg = "降级了";
                } else if (ex instanceof ParamFlowException) {
                    msg = "热点参数限流";
                } else if (ex instanceof SystemBlockException) {
                    msg = "系统规则（负载/...不满足要求）";
                } else if (ex instanceof AuthorityException) {
                    msg = "授权规则不通过";
                }

                // http状态码
                response.setStatus(500);
                response.setCharacterEncoding("utf-8");
                response.setHeader("Content-Type", "application/json;charset=utf-8");
                response.setContentType("application/json;charset=utf-8");
                // msg可以是對象
                new ObjectMapper().writeValue(response.getWriter(), msg);
            }
        };



    }
}
